text: TRISPHAT (full name tris(tetrachlorocatecholato)phosphate(1−)) is an inorganic anion with the formula  often prepared as the tributylammonium () or tetrabutylammonium ( salt. The anion features phosphorus(V) bonded to three tetrachlorocatecholate () ligands.  This anion can be resolved into the axially chiral enantiomers, which are optically stable (the picture shows the Δ enantiomer).
  The TRISPHAT anion has been used as a chiral shift reagent for cations. It improves the resolution of H NMR spectra by forming diastereomeric ion pairs.